bonjour
h ( x) = 5 x - 7
h ( - 2) = - 10 - 7 = - 17
g ( x) = 3 x² - 9 x - 7
g ( - 3) = 3 ( - 3 )² - 9 * - 3 - 7 = 27 + 27 - 7 = 47
g ( - 3) = 47
l'image de - 3 par g (x) est 47
3 x² - 9 x - 7 = 5 x - 7
3 x² - 9 x - 5 x = - 7 + 7
3 x² - 14 x = 0
x = 0
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bonjour
h ( x) = 5 x - 7
h ( - 2) = - 10 - 7 = - 17
g ( x) = 3 x² - 9 x - 7
g ( - 3) = 3 ( - 3 )² - 9 * - 3 - 7 = 27 + 27 - 7 = 47
g ( - 3) = 47
l'image de - 3 par g (x) est 47
3 x² - 9 x - 7 = 5 x - 7
3 x² - 9 x - 5 x = - 7 + 7
3 x² - 14 x = 0
x = 0